I was looking for a little advice on how to solve an issue with a Tomenosuke Kit. I purchased the kit brand new from someone. It was untouched. Everything was still in bags and taped down. When I inspected it I noticed the right side resin grip has a casting defect.

It's really hard to take a picture of it, but it looks like the resin didn't flow right. It goes deep in the resin and it's not a scratch. The edges are smooth. It would take a lot sanding down to make it smooth again but it would leave a flat spot with that much material removed.

Is there any way to get a replacement from Tomenosuke just for the right side or another set to make sure they color match?

since there is a defect in the kit, I would contact tomenosuke or Mune directly. I guess they will replace it.
Only issue is that you are not the original buyer, maybe the person you bought it from will need to do it for you...